I am having the same issue on my Mac with getting Vue 2023 to recognize the Poser 11 program. In the screenshot below, you can see the Poser application icon is grayed out. So what the heck do I do? I used to have Vue Infinite years ago;  I don't remember which version of Poser back then, but they played well together. Now it seems Vue just doesn't want anything to do with Poser and have the whole playground to itself. Aaaack!